Dewitts Dual Fans
Thread Starter
Racer
Joined: Oct 2007
Posts: 263
Likes: 7
From: Brownsville Texas
Dewitts Dual Fans
Before the dual fan install – I could hear the stock fan coming on pretty loud. LG Motorsports did the tune on the car and adjusted the fan temps - so I can assume that the stock fan was working properly – as it was noisy when the temperatures climbed over 215.
I am using the stock GM controller and the dual fans come on but I don’t hear them working so loud. It’s like they’re working maybe at 50% or so and my temperatures in traffic are higher than before.
I don’t think the fans are the problem. They spin free and aren’t touching anything. Do you think the setup requires a new ECM calibration?
Anyone run into a problem like this? Thanks guys.
I am using the stock GM controller and the dual fans come on but I don’t hear them working so loud. It’s like they’re working maybe at 50% or so and my temperatures in traffic are higher than before.
I don’t think the fans are the problem. They spin free and aren’t touching anything. Do you think the setup requires a new ECM calibration?
Anyone run into a problem like this? Thanks guys.
Safety Car
Joined: Oct 2006
Posts: 3,602
Likes: 3
From: Cincinnati OH
I think the obvious question is: what temps did LG program the fans to come on?
Then, is your coolant topped off, and of the right mixture?
Check for debri in the air dam areas just to be sure its not something silly.
Then, is your coolant topped off, and of the right mixture?
Check for debri in the air dam areas just to be sure its not something silly.
Thread Starter
Racer
Joined: Oct 2007
Posts: 263
Likes: 7
From: Brownsville Texas
Before the dual fan install - all was well. So - there are no coolant leaks nor is there any debis in the radiator area. This has got me stumped. I even asked John at Dewitts and he's stumped too.
Race Director
Joined: Dec 2005
Posts: 11,892
Likes: 107
From: God's Country, ID
Before the dual fan install – I could hear the stock fan coming on pretty loud. LG Motorsports did the tune on the car and adjusted the fan temps - so I can assume that the stock fan was working properly – as it was noisy when the temperatures climbed over 215.
I am using the stock GM controller and the dual fans come on but I don’t hear them working so loud. It’s like they’re working maybe at 50% or so and my temperatures in traffic are higher than before.
I don’t think the fans are the problem. They spin free and aren’t touching anything. Do you think the setup requires a new ECM calibration?
Anyone run into a problem like this? Thanks guys.
I am using the stock GM controller and the dual fans come on but I don’t hear them working so loud. It’s like they’re working maybe at 50% or so and my temperatures in traffic are higher than before.
I don’t think the fans are the problem. They spin free and aren’t touching anything. Do you think the setup requires a new ECM calibration?
Anyone run into a problem like this? Thanks guys.
When you swapped fans, I'm assuming you disconnected the hose running to your rad? Perhaps you have air trapped in the system. This will cause overheating.
Safety Car
Joined: Oct 2006
Posts: 3,602
Likes: 3
From: Cincinnati OH
Corvettes self-burbs for the most part, and any trapped air should quickly work out of the system, resulting in lower reservoir levels (if there is any significant volume of trapped air).
Thread Starter
Racer
Joined: Oct 2007
Posts: 263
Likes: 7
From: Brownsville Texas
When you replace the fan assembly - there is no need to disconnect any coolant hoses - so not air is in the system and no burping needed.
Last edited by Redrocket1045; May 4, 2012 at 12:05 AM. Reason: error
Racer
Joined: Apr 2006
Posts: 486
Likes: 2
From: The Villages FL
How are the dual fans wired, series or parallel? What is the wattage of the dual fan package compared to the OEM single fan unit. What I'm leading to is, a dual fan package may a good idea for radiator core coverage but, a poor idea if they are running at half speed due to controler limitations. You have some sytem investigation required.
Thread Starter
Racer
Joined: Oct 2007
Posts: 263
Likes: 7
From: Brownsville Texas
How are the dual fans wired, series or parallel? What is the wattage of the dual fan package compared to the OEM single fan unit. What I'm leading to is, a dual fan package may a good idea for radiator core coverage but, a poor idea if they are running at half speed due to controler limitations. You have some sytem investigation required.
Gotta keep looking - I guess.
Thanks for the input.
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Racer
Joined: Apr 2006
Posts: 486
Likes: 2
From: The Villages FL
Without seeing any fan data and going by what you said in your opening post, I'd say that the dual fan package does not flow as much air as the single OEM fan. You did not state why you converted to a dual fan system. The electric fan is there to provide airflow to the condenser and radiator from zero to approx. 10 MPH. Beyond that speed it presence is a restriction to the air flow created by the forward movement of the vehicle. There are performance requirements that must be met for park idle and city traffic conditions at 100 degrees F and with max A/C. Also cost and weight. From my experience with my car, except for terrible noise at high fan, I think the powertrain cooling people at Chevy did a good job with the OEM cooling fan.
Thread Starter
Racer
Joined: Oct 2007
Posts: 263
Likes: 7
From: Brownsville Texas
Without seeing any fan data and going by what you said in your opening post, I'd say that the dual fan package does not flow as much air as the single OEM fan. You did not state why you converted to a dual fan system. The electric fan is there to provide airflow to the condenser and radiator from zero to approx. 10 MPH. Beyond that speed it presence is a restriction to the air flow created by the forward movement of the vehicle. There are performance requirements that must be met for park idle and city traffic conditions at 100 degrees F and with max A/C. Also cost and weight. From my experience with my car, except for terrible noise at high fan, I think the powertrain cooling people at Chevy did a good job with the OEM cooling fan.
Spals dual fan package boosts air flow up 40% from stock. This fan package only fits our Direct Fit radiators. Note: Factory wiring will need to be cut and spliced in order for the factory ECM to operate the fans.
That's why I upgraded my stock factory GM single fan.
Race Director
Joined: Jun 2003
Posts: 14,051
Likes: 9
From: Houston TX
This is what the Dewitts website says about the fan package:
Spals dual fan package boosts air flow up 40% from stock. This fan package only fits our Direct Fit radiators. Note: Factory wiring will need to be cut and spliced in order for the factory ECM to operate the fans.
That's why I upgraded my stock factory GM single fan.
Spals dual fan package boosts air flow up 40% from stock. This fan package only fits our Direct Fit radiators. Note: Factory wiring will need to be cut and spliced in order for the factory ECM to operate the fans.
That's why I upgraded my stock factory GM single fan.
Instructor
Joined: Jan 2012
Posts: 120
Likes: 0
I wrestled with cooling problems for many months. This is slightly off-subject but something to consider when changing fans or increasing the amount of time the fan runs.
Look at the connector in this post: http://forums.corvetteforum.com/c6-t...t-working.html
This is a frequent problem for those of us whom run big HP in our Vettes.
I ended up maing my own connector out of a 1/2" x 1/2" x 2" aluminum and then insulating with shrink tubing.
UPDATE: The dewitts pulls more power and the connector will most likely melt. Not 100% positive as I did my connector years ago.
If I remember correctly 192 degrees is a little high (I think mine came on at 180) for those whom have installed SC's.
Look at the connector in this post: http://forums.corvetteforum.com/c6-t...t-working.html
This is a frequent problem for those of us whom run big HP in our Vettes.
I ended up maing my own connector out of a 1/2" x 1/2" x 2" aluminum and then insulating with shrink tubing.
UPDATE: The dewitts pulls more power and the connector will most likely melt. Not 100% positive as I did my connector years ago.
If I remember correctly 192 degrees is a little high (I think mine came on at 180) for those whom have installed SC's.
Last edited by OnTarget1; May 7, 2012 at 05:55 AM.
